Hey guys, I'm brand new at trying to fix these things but have been playing guitar longer than I care to remember. I have a little Frontman 15R that took a little extra voltage through the input jack when one of the plugs of my One Spot pedal power unit came into contact with one of the metal cases on one of my pedals. Blew the fuse. Replaced the fuse and now, turn it on, it blows the fuse. I'm do work for the phone company so I know there's either a short or something's grounded. I wanted to isolate the power supply circuit, the preamp circuit, and the amp circuit to see where it was. So far, not having much luck. Someone want to offer an old dog a new trick? Thanks, David